Ecology: Humid puna; on soil. Elevation: Bolivia: 4400 m. Distribution: Endemic to the tropical Andes (Bolivia).
Ecología: Puna; sobre suelo. Elevación: 4400 m. Distribución: Endémica para Bolivia.
Bryum crassinervum is related to B. alpinum according to Shaw (1987), distinguished by the highly branched stems giving the appearance of a lateral perichaetia.
Specimens: BOLIVIA. Cochabamba: Herzog 4774, 4840.